Crane



(No Model.) 2 Sheets- Sheet 1 Y J. S. WORTH.

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UNITED STATES PATENT OFFIcE.

JOHN S. WORTH, OF CCATESVILLE, PENNSYLVANIA.

CRANE.

SPECIFICATION forming part of Letters Patent No. 375,665, dated December27, 1887.

Application filed May 12, 1887. Serial No. 237,924. (No model.)

To all whom it may concern.-

Be it known that 1, JOHN S. WORTH, a citizen of the United States, and aresident of Coatesville, Chester county, Pennsylvania, have inventedcertain Improvements in Cranes and Hoists, of which the following is aspecification.

My invention relates to cranes in which the winch, steam or hydrauliccylinder, or other hoisting appliance is stationary, incontradistinct-ion to thosein which the hoisting device travels on thejib of the crane, the object of my invention being to so construct sucha crane that the load may be readily traversed from and toward the postof the crane without any change in the vertical position of said load.This object I attain in the manner which I will now proceed to describe,reference being had to the accompanying drawings, in which- Figure l isa side view of a crane having hoisting mechanism constructed inaccordance with my invention. Fig. 2 is a plan view of the crane, andFigs. 3 to 6 are diagrams illustrating other forms of crane or hoistembodying my invention.

Cranes in which the hoisting device is mounted upon and traversed to andfro on the jib of the crane are objectionable, because the weight ofsuch hoisting device interferes with the free traverse of the same toand fro on the jib, and where the hoisting device is a steamcylindertraveling on the jib there is the further objection that flexible tubingmust be employed to convey the steam to said cylinder, which tubing israpidly destroyed and must be frequently replaced.

In carrying out my invention, therefore, I discard the idea of mountingthe hoisting device on the jib so that it is movable to and fro thereon,and I use a fixed hoisting device in connection with a peculiar systemof carrierpulleys, whereby the load may be moved to or from the post ofthe crane without any change in its vertical position.

As shown in Fig. 1, A represents the vertical post of the crane, whichis provided at top and bottom with pivots intended to be adapted to anyavailable sockets, so that the post is free to swing on its axis.

The projecting jib of the crane comprises in the present instanceopposite side beams, B, securely bolted to the vertical post A andstiffened by appropriate braces, D. To a suit-- able bearing on the postA is adapted the shaft of a winch, a, on which is wound the hoistingropea, said rope passing over a series of carrier-pulleys, b, d, and f, andbeing provided at its outer pendent end with any suitable means forattaching thereto the object to be lifted. The shaft of the pulley b isadapted to fixed bearings c on the jib of the crane, and said shaft isconnected by arms 9 to the shaft of the intermediate pulley, (7,, whichlatter shaft is connected by arms h to the shaft of the outer pulley, f,the latter being provided with wheels i, adapted to suitable tracks onthe beams B, forming thejib of the crane. By this arrangement the outerpulley,f, may be moved freely from and toward the inner pulley, b,without slackening or drawing upon that portion of the rope between thepulleys b and f, for as the pulleyf is moved inward the pulley d risesto take up any slack which might otherwise be formed, and as the pulleyfis drawn outward the pulley d descends to deliver the slack which ittook up on its rise, no change in the vertical position of the weightresulting from the moving of the same in or out. The weight of the loadbeing exerted with equal force upon the pulleys I), (Z, andf has no tendency to depress the central pulley, and the weight of the latter and ofthe armsg and h is counterbalanced by means of a weighted arm, m,secured to the shaft of the pulley b.

In Fig. 3 I have shown my invention applied to a crane in which asteamor hydraulic cylinder, a, takes the place of the winch shown in Fig. l,the pivots of the post A in this case being hollow for the reception ofthe steam and exhaust pipes. In this case, also, the shaft of the pulleyb is adapted to bearings c beneath the jib of the crane, instead ofabove the same, as in Fig.1, the army being lengthened to correspondwith this change in the position of the pulley. This constructionprovides for greater range of movement than that shown in Fig. 1. \Vherean extreme range of movement is required, however, the system ofcarrier-pulleys and connecting-arms may be multiplied, as shown in Fig.4, for instance, in which there are two sets of carrier-pulleys, b, d,and f and b, d, and f, and two sets of connecting-arms, 9 hand 9 h. Theadjacent ends of the arms h and g in this construction are connected bya frame, a, whereby they are always maintained in the same relation toeach other, and this frame carries an idler-pulley, p, intermediate ofthe pulleys f and b, the rope passing beneath this intermediate pulley.The arms h and 9 may be connected by intermediate pivoted arms, 8, so asto cause them to move in unison, but this is not absolutely essential. I

A minor advantage of my invention is that the outer carrier-pulley canbe projected to the extreme end of the jib of the crane, so that thehoisting rope or chain hangs down beyond the end of said jib, wherebythe weight can be readily transferred from said rope or chain to that ofan adjoining crane.

Although I have shown the hoisting device as carried by the verticalpost of the crane, this is not essential to my invention. For instance,the pulley may be replaced by a hoisting-drum, as shown by dotted linesin Fig. 3, said drum being operated by a small engine, or having powerotherwise suitably applied thereto. .Hence in every case in which suchdrum can be used in place of the inner pulley I consider it theequivalent of the latter an claim it at such.

Besides the advantage of ready manipulation possessed by my improvedcrane as compared with those having the hoisting devices movable on thejib, said improved crane is of cheaper construction, the parts being ofthe simplest character, and no expensive fitting being required.

The power of the hoisting device may, as in an ordinary crane, beincreased by the use of a double rope looped for the reception of apulley to which the load is suspended, double pulleys d and f being usedin this case, and one of the inner ends of the rope passing round andbeing secured adjacent to the pulley or drum 1;, while the other of saidinner ends is connected to the hoisting device.

My improved arrangement of carrier-pulleys can be used on a fixed ortraveling beam or girder in a mill or other structure, as well as on thejib of a swinging crane, as will be readily understood. In Fig. 5, forinstance, I have illustrated a special form of hoist embodying myinvention. In this case there is asecoudary longitudinalsupporting-beam, B, parallel with the beams B, and a third transversesupporting-structure, B secured at one end to a wheeled frame, a,running on the beam B, and at the opposite end to a Wheeled frame, a,running on the beams B. There are two sets of pulleys, b df and b df,two sets ofarms, g h and g h, and an intermediate idlerpulley, 1),carried by the frame a, as in Fig. 4; but the second set of arms andpulleys are at right angles to the first, the outer pulley, f,traversing the transverse-supporting-structure B and the pulley ftraversing the longitudinal beams B. By means of this structure the loadcan be handled at any point Within the area of a quadrangle of which thebeams B B are the opposite sides, the rope being op-.

erated by a stationary engine or other suitable motor located at or.

In Fig. 6 I have shown a multiple arrangement of pulleys of a simplercharacter than that shown in Fig. 4, a single pulley located beneath thebeam replacing the movable frame with its three pulleys shown in thelatter figure.

I claim as my invention- 1. The combination of the supporting-beam andhoisting rope or chain of a crane or hoist with an inner pulley, anouter pulley, an intermediate pulley, and arms connecting the shafts ofsaid pulleys, whereby as the outer pulley is moved toward or from theinner pulley the intermediate pulley is caused to rise or fall, allsubstantially as specified.

2. The combination of the supporting-beam and the hoisting rope orchain, inner, outer, and intermediate pulleys, arms connecting theshafts of the same, and a weighted counterbalancearm, all substantiallyas specified.

3. The combination of the supporting-beam and the hoisting rope orchain, an inner pulley, an outer pulley, a series of intermediatepulleys, and arms connecting the shafts of the pulleys, allsubstantially as specified.

4. The combination of the supporting-beam and the hoisting rope orchain, an inner pulley, an outer pulley, a series of intermediatepulleys, a movable frame carrying the central pulleys of said series,and arms connecting the shafts of the various pulleys, all substantiallyas specified.

5. The combination of the supporting-structure of a craneor hoist,comprising fixed longitudinal beams and a movable transverse beam, ahoisting rope or chain, and two sets of carrier-pulleys, one mounted onone of the longitudinal beams and the other on the transverse beam, andeach set comprising an inner, an outer, and an intermediate pulley, andarms connecting the shafts of said pulleys, all substantially asspecified.

6. The combination of the post and jib of a crane, the hoisting rope orchain, inner,

outer, and intermediate pulleys carried by the jib, arms connecting theshafts of said pulleys, and a hoisting appliance carried by the fixedframe-work of the crane, all substantially as specified.

7. The combination of the pivoted post of the crane and its jib, thehoisting rope or chain, inner, outer, and intermediate pulleys carriedby the jib, arms connecting the shafts of said pulleys, and a hoistingcylinder or engine carried by the fixed frame-work of the crane andreceiving its supply of motive fluid through a hollow pivot of saidpost, all substantially as specified.

In testimony whereof I have signed my name to this specification in thepresence of two sub scribing witnesses.

JOHN S. WORTH. \Vitnesses:

N. H. STONE, J OHN JOHNSTON.

